topic Re: the problem about UART isr in Kinetis Design Studio

the problem about UART isr

wyflsxy — Thu, 17 Sep 2015 01:42:37 GMT

hello ,it's about the problem about UART ISR

I used to compile environment is KDS3.0

Using a KSDK1.2 and MQX4.2,and my board is frdmk64f

I want to rec data form uart with ISR

but when I install the uart0 isr,

the Interrupt handler is constantly triggered, whatever I have to send or receive data from UART0

I don't know what's the problem

Is it because UART0 is the default input port？

In addition, I want to know why the code “printf("\ncounter = %d\n", g_isr_data.COUNTER);”

could output data to uart0

void new_isr(void *user_isr_ptr)

{

MY_ISR_STRUCT_PTR isr_ptr;

isr_ptr = (MY_ISR_STRUCT_PTR)user_isr_ptr;

isr_ptr->COUNTER++;

/* It is common to chain interrupts */

/* isr_ptr->OLD_ISR(isr_ptr->OLD_ISR_DATA); */

}

main_task(){

INT_SYS_EnableIRQ(SW_IRQ);

/** Demonstration of mqx interrupt installation. Works with vector table placed in RW as well as RO memory **/

g_isr_data.COUNTER = 0;

g_isr_data.OLD_ISR_DATA = _int_get_isr_data(SW_IRQ);

g_isr_data.OLD_ISR = _int_get_isr(SW_IRQ);

/* Install MQX isr routine. This function does not change vector table */

old_isr = _int_install_isr(SW_IRQ, new_isr, &g_isr_data);

}

Re: the problem about UART isr

wyflsxy — Thu, 17 Sep 2015 06:13:35 GMT

my project is build with ksdk1.2 with out PE,how can I change the "printf" output from UART0 to UART1?

Re: the problem about UART isr

ivadorazinova — Thu, 17 Sep 2015 08:14:03 GMT

Hi wang yufei,

please what do you use for MCU?

Best Regards,

Iva

Re: the problem about UART isr

wyflsxy — Thu, 17 Sep 2015 08:24:04 GMT

what did you mean?

I want to receive data form uart by interrupt

but,when I install a uart0 interrupt about like "_int_install_isr(SW_IRQ, new_isr, &g_isr_data);"

the interrupt funtion "new_isr()"was constantly triggered, whatever I havn't send or receive data from UART0

Alice_YangHui_Ma

Re: the problem about UART isr

ivadorazinova — Fri, 18 Sep 2015 11:31:01 GMT

Hi wang,

please take a look at these documents :

How To: Using Interrupt Handlers in MQX with KSDK

or Interrupt handling with PE

Interrupt handling with KSDK and Kinetis Design Studio

I hope this helps.

Best Regards,

Iva

Re: the problem about UART isr

wyflsxy — Mon, 21 Sep 2015 05:52:51 GMT

I saw the demo and found that it need to clear the interrupt flag bit in GPIO interrupt program with "GPIO_DRV_ClearPinIntFlag (kGpioSW2);"

So did the UART interrupt program also need to clear the interrupt flag ?

however I did not found the clear interrupt flag programe for uart in the API or the header files?

could you help me?